Parent Company only Condensed Financial Information - Balance Sheets (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 1,131,073,000	$ 457,370,000
Total assets	4,634,114,000	4,109,463,000	$ 3,096,562,000
Liabilities and Shareholders' Equity
Subordinated debt, net of issuance costs	39,740,000	39,554,000
Shareholder's equity	577,889,000	576,708,000	$ 367,466,000	$ 271,239,000
Total liabilities and shareholders' equity	4,634,114,000	4,109,463,000
HCC (Parent)
Assets
Cash and cash equivalents	20,378,000	20,260,000
Investment in subsidiary bank	595,681,000	594,868,000
Other assets	1,881,000	1,761,000
Total assets	617,940,000	616,889,000
Liabilities and Shareholders' Equity
Subordinated debt, net of issuance costs	39,740,000	39,554,000
Other liabilities	311,000	627,000
Shareholder's equity	577,889,000	576,708,000
Total liabilities and shareholders' equity	$ 617,940,000	$ 616,889,000